Join Date: Dec 2013
Location: SF Bay Area, California
If you have florescent lights, especially the long tube kind, try unplugging it. They can induce an electric charge in water without physical contact with it.
Any other equipment? Don't discount anything.
Fish and shrimp are usually fine since they're not grounded to anything, so there's no electrical flow through their bodies. But still, this is not a good situation.
Sounds like you don't have a GFCI installed. Get one installed for the outlet that you tank plugs into. If there is a current leak it will trip and cut off power to prevent you from getting shocked.
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